Checkbox displayed on wrong line

Checkboxes are displaying on the wrong line for two of eight checkboxes using any browser. However when I view the source code in MS Express Web it looks correct. See sample images here:

correct
http://tinypic.com/r/e5qq1v/9

incorrect
http://tinypic.com/r/s3fyuq/9

Thank you

https://wordpress.org/plugins/contact-form-7/